1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "table/sprites.h"

     6

#include "table/strings.h"

     7

#include "functions.h"

     8

#include "map.h"

     9

#include "tile.h"

    10

#include "vehicle.h"

    11

#include "viewport.h"

    12

#include "command.h"

    13

#include "player.h"

    14

#include "town.h"

    15

#include "gfx.h"

    16

#include "sound.h"

    17

#include "depot.h"

    18

    19

/* When true, GetTrackStatus for roads will treat roads under reconstruction

    20

 * as normal roads instead of impassable. This is used when detecting whether

    21

 * a road can be removed. This is of course ugly, but I don't know a better

    22

 * solution just like that... */

    23

static bool _road_special_gettrackstatus;

    24

    25

void RoadVehEnterDepot(Vehicle *v);

    26

    27

    28

static bool HasTileRoadAt(TileIndex tile, int i)

    29

{

    30

	int mask;

    31

	byte b;

    32

    33

	switch (GetTileType(tile)) {

    34

	case MP_STREET:

    35

		b = _m[tile].m5;

    36

    37

		if ((b & 0xF0) == 0) {

    38

		} else if (IsLevelCrossing(tile)) {

    39

			b = (b&8)?5:10;

    40

		} else if ((b & 0xF0) == 0x20) {

    41

			return (~b & 3) == i;

    42

		} else

    43

			return false;

    44

		break;

    45

    46

	case MP_STATION:

    47

		b = _m[tile].m5;

    48

		if (!IS_BYTE_INSIDE(b, 0x43, 0x43+8))

    49

			return false;

    50

		return ((~(b - 0x43) & 3) == i);

    51

    52

	case MP_TUNNELBRIDGE:

    53

		mask = GetRoadBitsByTile(tile);

    54

		b = 10; if (mask & 1) break;

    55

		b = 5;  if (mask & 2) break;

    56

		return false;

    57

    58

	default:

    59

		return false;

    60

	}

    61

    62

	return HASBIT(b, i);

    63

}

    64

    65

static bool CheckAllowRemoveRoad(TileIndex tile, uint br, bool *edge_road)

    66

{

    67

	int blocks;

    68

	byte owner;

    69

	uint n;

    70

	*edge_road = true;

    71

    72

	if (_game_mode == GM_EDITOR)

    73

		return true;

    74

    75

	blocks = GetRoadBitsByTile(tile);

    76

	if (blocks == 0)

    77

		return true;

    78

    79

	// Only do the special processing for actual players.

    80

	if (_current_player >= MAX_PLAYERS)

    81

		return true;

    82

    83

	// A railway crossing has the road owner in the map3_lo byte.

    84

	if (IsTileType(tile, MP_STREET) && IsLevelCrossing(tile)) {

    85

		owner = _m[tile].m3;

    86

	} else {

    87

		owner = GetTileOwner(tile);

    88

	}

    89

	// Only do the special processing if the road is owned

    90

	// by a town

    91

	if (owner != OWNER_TOWN) {

    92

		return owner == OWNER_NONE || CheckOwnership(owner);

    93

	}

    94

    95

	if (_cheats.magic_bulldozer.value)

    96

		return true;

    97

    98

	// Get a bitmask of which neighbouring roads has a tile

    99

	n = 0;

   100

	if (blocks&0x25 && HasTileRoadAt(TILE_ADDXY(tile,-1, 0), 1)) n |= 8;

   101

	if (blocks&0x2A && HasTileRoadAt(TILE_ADDXY(tile, 0, 1), 0)) n |= 4;

   102

	if (blocks&0x19 && HasTileRoadAt(TILE_ADDXY(tile, 1, 0), 3)) n |= 2;

   103

	if (blocks&0x16 && HasTileRoadAt(TILE_ADDXY(tile, 0,-1), 2)) n |= 1;

   104

   105

	// If 0 or 1 bits are set in n, or if no bits that match the bits to remove,

   106

	// then allow it

   107

	if ((n & (n-1)) != 0 && (n & br) != 0) {

   108

		Town *t;

   109

		*edge_road = false;

   110

		// you can remove all kind of roads with extra dynamite

   111

		if (_patches.extra_dynamite)

   112

			return true;

   113

   114

		t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   115

   116

		SetDParam(0, t->index);

   117

		_error_message = STR_2009_LOCAL_AUTHORITY_REFUSES;

   118

		return false;

   119

	}

   120

   121

	return true;

   122

}

   123

   124

uint GetRoadBitsByTile(TileIndex tile)

   125

{

   126

	uint32 r = GetTileTrackStatus(tile, TRANSPORT_ROAD);

   127

	return (byte)(r | (r >> 8));

   128

}

   129

   130

/** Delete a piece of road.

   131

 * @param x,y tile coordinates for road construction

   132

 * @param p1 road piece flags

   133

 * @param p2 unused

   134

 */

   135

int32 CmdRemoveRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   136

{

   137

	// cost for removing inner/edge -roads

   138

	static const uint16 road_remove_cost[2] = {50, 18};

   139

   140

	TileInfo ti;

   141

	int32 cost;

   142

	TileIndex tile;

   143

	PlayerID owner;

   144

	Town *t;

   145

	/* true if the roadpiece was always removeable,

   146

	 * false if it was a center piece. Affects town ratings drop */

   147

	bool edge_road;

   148

	byte pieces = (byte)p1;

   149

   150

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   151

   152

	/* Road pieces are max 4 bitset values (NE, NW, SE, SW) */

   153

	if (pieces >> 4) return CMD_ERROR;

   154

   155

	FindLandscapeHeight(&ti, x, y);

   156

	tile = ti.tile;

   157

   158

	if (!IsTileType(tile, MP_STREET) && !IsTileType(tile, MP_TUNNELBRIDGE)) return CMD_ERROR;

   159

   160

	// owner for railroad crossing is stored somewhere else

   161

	// XXX - Fix this so for a given tiletype the owner of the type is in the same variable

   162

	owner = IsLevelCrossing(tile) ? _m[tile].m3 : GetTileOwner(tile);

   163

   164

	if (owner == OWNER_TOWN && _game_mode != GM_EDITOR) {

   165

		if (IsTileType(tile, MP_TUNNELBRIDGE)) { // index of town is not saved for bridge (no space)

   166

			t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   167

		} else

   168

			t = GetTown(_m[tile].m2);

   169

	} else

   170

		t = NULL;

   171

   172

	// allow deleting road under bridge

   173

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))

   174

		return CMD_ERROR;

   175

   176

	{

   177

		bool b;

   178

		_road_special_gettrackstatus = true;

   179

		b = CheckAllowRemoveRoad(tile, pieces, &edge_road);

   180

		_road_special_gettrackstatus = false;

   181

		if (!b) return CMD_ERROR;

   182

	}

   183

   184

	if (ti.type == MP_TUNNELBRIDGE) {

   185

		if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile)))

   186

			return CMD_ERROR;

   187

   188

		if ((ti.map5 & 0xE9) == 0xE8) {

   189

			if (pieces & 10) goto return_error;

   190

		} else if ((ti.map5 & 0xE9) == 0xE9) {

   191

			if (pieces & 5) goto return_error;

   192

		} else

   193

			goto return_error;

   194

   195

		cost = _price.remove_road * 2;

   196

   197

		if (flags & DC_EXEC) {

   198

			ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   199

			_m[tile].m5 = ti.map5 & 0xC7;

   200

			SetTileOwner(tile, OWNER_NONE);

   201

			MarkTileDirtyByTile(tile);

   202

		}

   203

		return cost;

   204

	} else if (ti.type == MP_STREET) {

   205

		// check if you're allowed to remove the street owned by a town

   206

		// removal allowance depends on difficulty setting

   207

		if (!CheckforTownRating(tile, flags, t, ROAD_REMOVE)) return CMD_ERROR;

   208

   209

		// XXX - change cascading ifs to switch when doing rewrite

   210

		if ((ti.map5 & 0xF0) == 0) { // normal road

   211

			byte c = pieces, t2;

   212

   213

			if (ti.tileh != 0  && (ti.map5 == 5 || ti.map5 == 10)) {

   214

				c |= (c & 0xC) >> 2;

   215

				c |= (c & 0x3) << 2;

   216

			}

   217

   218

			// limit the bits to delete to the existing bits.

   219

			if ((c &= ti.map5) == 0) goto return_error;

   220

   221

			// calculate the cost

   222

			t2 = c;

   223

			cost = 0;

   224

			do {

   225

				if (t2&1) cost += _price.remove_road;

   226

			} while(t2>>=1);

   227

   228

			if (flags & DC_EXEC) {

   229

				ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   230

   231

				_m[tile].m5 ^= c;

   232

				if (GB(_m[tile].m5, 0, 4) == 0) {

   233

					DoClearSquare(tile);

   234

				} else {

   235

					MarkTileDirtyByTile(tile);

   236

				}

   237

			}

   238

			return cost;

   239

		} else if ((ti.map5 & 0xE0) == 0) { // railroad crossing

   240

			byte c;

   241

   242

			if (!(ti.map5 & 8)) {

   243

				c = 2;

   244

				if (pieces & 5) goto return_error;

   245

			} else {

   246

				c = 1;

   247

				if (pieces & 10) goto return_error;

   248

			}

   249

   250

			cost = _price.remove_road * 2;

   251

			if (flags & DC_EXEC) {

   252

				ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   253

   254

				ModifyTile(tile,

   255

					MP_SETTYPE(MP_RAILWAY) |

   256

					MP_MAP2_CLEAR | MP_MAP3LO | MP_MAP3HI_CLEAR | MP_MAP5,

   257

					_m[tile].m4 & 0xF, /* map3_lo */

   258

					c											/* map5 */

   259

				);

   260

			}

   261

			return cost;

   262

		} else

   263

			goto return_error;

   264

   265

	} else {

   266

return_error:;

   267

		return_cmd_error(INVALID_STRING_ID);

   268

	}

   269

}

   270

   271

   272

enum {

   273

	ROAD_NW = 1, // NW road track

   274

	ROAD_SW = 2, // SW road track

   275

	ROAD_SE = 4, // SE road track

   276

	ROAD_NE = 8, // NE road track

   277

	ROAD_ALL = (ROAD_NW | ROAD_SW | ROAD_SE | ROAD_NE)

   278

};

   279

   280

static const byte _valid_tileh_slopes_road[3][15] = {

   281

	// set of normal ones

   282

	{

   283

		ROAD_ALL, 0, 0,

   284

		ROAD_SW | ROAD_NE, 0, 0,  // 3, 4, 5

   285

		ROAD_NW | ROAD_SE, 0, 0,

   286

		ROAD_NW | ROAD_SE, 0, 0,  // 9, 10, 11

   287

		ROAD_SW | ROAD_NE, 0, 0

   288

	},

   289

	// allowed road for an evenly raised platform

   290

	{

   291

		0,

   292

		ROAD_SW | ROAD_NW,

   293

		ROAD_SW | ROAD_SE,

   294

		ROAD_NW | ROAD_SE | ROAD_SW,

   295

   296

		ROAD_SE | ROAD_NE, // 4

   297

		ROAD_ALL,

   298

		ROAD_SW | ROAD_NE | ROAD_SE,

   299

		ROAD_ALL,

   300

   301

		ROAD_NW | ROAD_NE, // 8

   302

		ROAD_SW | ROAD_NE | ROAD_NW,

   303

		ROAD_ALL,

   304

		ROAD_ALL,

   305

   306

		ROAD_NW | ROAD_SE | ROAD_NE, // 12

   307

		ROAD_ALL,

   308

		ROAD_ALL

   309

	},

   310

	// valid railway crossings on slopes

   311

	{

   312

		1, 0, 0, // 0, 1, 2

   313

		0, 0, 1, // 3, 4, 5

   314

		0, 1, 0, // 6, 7, 8

   315

		0, 1, 1, // 9, 10, 11

   316

		0, 1, 1, // 12, 13, 14

   317

	}

   318

};

   319

   320

   321

static uint32 CheckRoadSlope(int tileh, byte *pieces, byte existing)

   322

{

   323

	if (!IsSteepTileh(tileh)) {

   324

		byte road_bits = *pieces | existing;

   325

   326

		// no special foundation

   327

		if ((~_valid_tileh_slopes_road[0][tileh] & road_bits) == 0) {

   328

			// force that all bits are set when we have slopes

   329

			if (tileh != 0) *pieces |= _valid_tileh_slopes_road[0][tileh];

   330

			return 0; // no extra cost

   331

		}

   332

   333

		// foundation is used. Whole tile is leveled up

   334

		if ((~_valid_tileh_slopes_road[1][tileh] & road_bits) == 0) {

   335

			return existing ? 0 : _price.terraform;

   336

		}

   337

   338

		// partly leveled up tile, only if there's no road on that tile

   339

		if ( !existing && (tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8) ) {

   340

			// force full pieces.

   341

			*pieces |= (*pieces & 0xC) >> 2;

   342

			*pieces |= (*pieces & 0x3) << 2;

   343

			return (*pieces == (ROAD_NE|ROAD_SW) || *pieces == (ROAD_SE|ROAD_NW)) ? _price.terraform : CMD_ERROR;

   344

		}

   345

	}

   346

	return CMD_ERROR;

   347

}

   348

   349

/** Build a piece of road.

   350

 * @param x,y tile coordinates for road construction

   351

 * @param p1 road piece flags

   352

 * @param p2 the town that is building the road (0 if not applicable)

   353

 */

   354

int32 CmdBuildRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   355

{

   356

	TileInfo ti;

   357

	int32 cost;

   358

	byte pieces = (byte)p1, existing = 0;

   359

	TileIndex tile;

   360

   361

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   362

   363

	/* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero

   364

	 * if a non-player is building the road */

   365

	if ((pieces >> 4) || (_current_player < MAX_PLAYERS && p2 != 0) || !IsTownIndex(p2)) return CMD_ERROR;

   366

   367

	FindLandscapeHeight(&ti, x, y);

   368

	tile = ti.tile;

   369

   370

	// allow building road under bridge

   371

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile)) return CMD_ERROR;

   372

   373

	if (ti.type == MP_STREET) {

   374

		if (!(ti.map5 & 0xF0)) {

   375

			if ((pieces & (byte)ti.map5) == pieces)

   376

				return_cmd_error(STR_1007_ALREADY_BUILT);

   377

			existing = ti.map5;

   378

		} else {

   379

			if (!(ti.map5 & 0xE0) && pieces != ((ti.map5 & 8) ? 5 : 10))

   380

				return_cmd_error(STR_1007_ALREADY_BUILT);

   381

			goto do_clear;

   382

		}

   383

	} else if (ti.type == MP_RAILWAY) {

   384

		byte m5;

   385

   386

		if (IsSteepTileh(ti.tileh)) // very steep tile

   387

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   388

   389

		if(!_valid_tileh_slopes_road[2][ti.tileh]) // prevent certain slopes

   390

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   391

   392

		if (ti.map5 == 2) {

   393

			if (pieces & 5) goto do_clear;

   394

			m5 = 0x10;

   395

		} else if (ti.map5 == 1) {

   396

			if (pieces & 10) goto do_clear;

   397

			m5 = 0x18;

   398

		} else

   399

			goto do_clear;

   400

   401

		if (flags & DC_EXEC) {

   402

			ModifyTile(tile,

   403

				MP_SETTYPE(MP_STREET) |

   404

				MP_MAP2 | MP_MAP3LO | MP_MAP3HI | MP_MAP5,

   405

				p2,

   406

				_current_player, /* map3_lo */

   407

				_m[tile].m3 & 0xF, /* map3_hi */

   408

				m5 /* map5 */

   409

			);

   410

		}

   411

		return _price.build_road * 2;

   412

	} else if (ti.type == MP_TUNNELBRIDGE) {

   413

   414

		/* check for flat land */

   415

		if (IsSteepTileh(ti.tileh)) // very steep tile

   416

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   417

   418

		/* is this middle part of a bridge? */

   419

		if ((ti.map5 & 0xC0) != 0xC0)

   420

				goto do_clear;

   421

   422

		/* only allow roads pertendicular to bridge */

   423

		if (((pieces & 5U) != 0) == ((ti.map5 & 0x01U) != 0))

   424

				goto do_clear;

   425

   426

		/* check if clear land under bridge */

   427

		if ((ti.map5 & 0xF8) == 0xE8) 			/* road under bridge */

   428

				return_cmd_error(STR_1007_ALREADY_BUILT);

   429

		else if ((ti.map5 & 0xE0) == 0xE0) 	/* other transport route under bridge */

   430

				return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);

   431

		else if ((ti.map5 & 0xF8) == 0xC8) 	/* water under bridge */

   432

				return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   433

   434

		/* all checked, can build road now! */

   435

		cost = _price.build_road * 2;

   436

		if (flags & DC_EXEC) {

   437

			ModifyTile(tile,

   438

				MP_MAPOWNER_CURRENT | MP_MAP5,

   439

				(ti.map5 & 0xC7) | 0x28 // map5

   440

			);

   441

		}

   442

		return cost;

   443

	} else {

   444

do_clear:;

   445

		if (CmdFailed(DoCommandByTile(tile, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR)))

   446

			return CMD_ERROR;

   447

	}

   448

   449

	cost = CheckRoadSlope(ti.tileh, &pieces, existing);

   450

	if (CmdFailed(cost)) return_cmd_error(STR_1800_LAND_SLOPED_IN_WRONG_DIRECTION);

   451

   452

	if (cost && (!_patches.build_on_slopes || _is_old_ai_player))

   453

		return CMD_ERROR;

   454

   455

	if (ti.type != MP_STREET || (ti.map5 & 0xF0) != 0) {

   456

		cost += DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   457

	} else {

   458

		// Don't put the pieces that already exist

   459

		pieces &= ~ti.map5;

   460

	}

   461

   462

	{

   463

		byte t = pieces;

   464

		while (t) {

   465

			if (t & 1) cost += _price.build_road;

   466

			t >>= 1;

   467

		}

   468

	}

   469

   470

	if (flags & DC_EXEC) {

   471

		if (ti.type != MP_STREET) {

   472

			SetTileType(tile, MP_STREET);

   473

			_m[tile].m5 = 0;

   474

			_m[tile].m2 = p2;

   475

			SetTileOwner(tile, _current_player);

   476

		}

   477

   478

		_m[tile].m5 |= pieces;

   479

   480

		MarkTileDirtyByTile(tile);

   481

	}

   482

	return cost;

   483

}

   484

   485

int32 DoConvertStreetRail(TileIndex tile, uint totype, bool exec)

   486

{

   487

	// not a railroad crossing?

   488

	if (!IsLevelCrossing(tile)) return CMD_ERROR;

   489

   490

	// not owned by me?

   491

	if (!CheckTileOwnership(tile) || !EnsureNoVehicle(tile)) return CMD_ERROR;

   492

   493

	// tile is already of requested type?

   494

	if (GB(_m[tile].m4, 0, 4) == totype) return CMD_ERROR;

   495

   496

	if (exec) {

   497

		// change type.

   498

		SB(_m[tile].m4, 0, 4, totype);

   499

		MarkTileDirtyByTile(tile);

   500

	}

   501

   502

	return _price.build_rail >> 1;

   503

}

   504

   505

   506

/** Build a long piece of road.

   507

 * @param x,y end tile of drag

   508

 * @param p1 start tile of drag